Log-unloader



(No Mudel.)

W. E. HILL.

Wil i i 1'! 1' :f 1T1 WW I I l H I'M \A/l'in esseg. I71 v/enio 2 time STATES YVILIJIAM E. HILL, OF KALAMAZOO, MICHIGAN.

LOG-UNLOADER.

.ZPICZFICATION forming part of Letters Patent No. 324,840, dated August 25, 1885.

(No model.)

T 0 aZZ whom it may concern/r Be itknown that I, \VILLIAM E. HILL, acitizen of the United States, residing at Kalama- 'Zoo, county of Kalamazoo, State of Michigan,

have invented a new and useful LogUnloader, of which the following is a specification.

This invention relates to that class of devices which are provided with pivoted arms stationed beneath the log and adapted to be pushed against the log by connecting power for the purpose of throwing or moving the log in either lateral direction.

It has for its object an improved construction, substantially as hereinafter described and claimed.

In the drawings forming apart of this specification, Figure 1 is a broken plan elevation, the skidway-fioor beingin crosssection; Fig. 2, a top view with portions broken away; Fig. 3, a broken detail in enlarged perspective; and Fig. 4 is a plan view of an enlarged detail.

The sills D and floor d representa log-skidway or mill -floor inclining downward each way from a log-trough. In this logtrough is located a log-conveyor, O, in the usual manner. Such conveyors engage the under side of the log L, and are used to convey the log from the river or other place to any desired place in the mill. In this case the log is conveyed to the device for unloading the same out of the log-trough when the logs roll down the skidway on rails ff to the saw or log carriage, as the case may be. (The saw and log carriage not here shown.)

Below the floor d is a bed-beam, E, to which the engine F is centrally pivoted, the engine being thus adapted to tilt during the operation. Beneath the log-trough is a rock-shaft, o, to a pendent arm, 6, of which the free end of the engine-piston is pivotally connected. At each end of said rock-shaft, or at other suitable location, are rigidly connected the double log-levers B. In the drawings these levers are in substantially a U form, and are connected with each other where they are secured to the rock-shaft, the free ends thereof extending on each side up toward the log Il- Ooncavcd pockets are formed in the free ends of the levers, and are adapted to'retain therein spherical balls a a, in a manner that said balls will turn in the pockets when their exposed balls thus retained in the pockets are universal friction-balls. The great advantage of this style of friction devices in the end of the le Vers is that as they will roll in any direction it matters not what condition of the surface of the log comes in contact therewith, and for the same reason they may be brought in contact with a log while under endwise motion without danger of breaking the levers or friction devices.

As a means of keeping the double lever B in a balanced position, so that neither free end will be liable to conflict with the log when not in operation, I provide two weights, w w, and connect them with the arm eby means of ropes or chains, which pass over pulleys a", connected with any suitable support. Thus the weights, being of the same heft, exertalike mrchase on the end of the arm a and keep the double lcver in position, as in prior constructions; but it is found necessary to limit the fall of the weights, and in most instances the distance to the ground or floor below the weights is too great to use the floor for a limit. Hence I have made the bearing-blocks of the pulleys over which the chains 8 srun with an upward proj( ction, through which the chains pass, and provide the chains with a knot or collar, forming stops, which come in contact with said up ward projection of the pulley-blocks, and thus limit the fall of the weights, all as shown in Fig. 1. By the means of said limit the rocklevers sooner assume a position at rest.

In the operation, by causing the engine-piston to move outward, the rockshaft is rotated, causing the right-hand free end of the double lever B to engage the log, throwing the same out of the logtrough, when the log rolls down the left-hand incline rails f f. The opposite movement of the piston would. of course throw the log in the other lateral direction. During this action the engine F tilts on its pivot to conform to the sweep of the arm 0, thus insuring a free positive action by a very simple construction and combination of parts.

I am aware that roclclevers for rolling logs and pivotally-supported engines are not new, per 80, in this application. I am also aware that the free ends of the rock-levers have here tofore been provided with rollers capable of moving in a single direction under the euperiphery comes in contact with thelog. The I gagement of the 10 Having thus described my invention, whatI claim as new, and desire to secure by Letters Patent, is

1. An improved log-unloader consisting of a rock-shaft beneath the log-trough, the double rocking levers, and a downwardly-extending operating-lever secured to the rock-shaft, and a horizontal pivoted engine, the free end of its piston pivotally connecting with the free end of the operating-lever, substantially as set forth. 1

2. The combination of the rock-lever and shaft, the operating-lever projecting from said shaft, means for oscillating the operating-1ever, the fixed pulley-blocks having the stopprojections, pulleys in said blocks, and the weighted chains or ropes connecting the operating-lever passing over the pulleys, and provided with the stops for conflicting with the stop projections of the pulley-blocks to limit the fall of the weighted end of the chains, substantially as set forth.

In testimony of the foregoing I have hereunto subscribed my name in presence of two witnesses.

WVILLIAM E. HILL.

Witnesses:

J OI'IN H. CHASE, GEO. D. B. HALL. 

